Modify a text file: $/39/p2a.java

$/39/p2a.java

//// Practice project #2a
//// p2a.java  (bam:3920)

String title=  "Practice project #2";
String author="Bruce Alan Martin  (2013 Sep 20)";
  int g=  200;    // Grass color.

int score=0;
float horizon;
float heroX=20, heroY=300, heroDX=0, heroDY=0;
float monsterX=500, monsterY=200, monsterDX=4, monsterDY=3;
float birdsX=10, birdsY=100, birdsDX=6, birdsDY=0;
float targetX=-20, targetY=-20;    // (off-screen)

void setup() {
  //// Init.
  size( 800, 600 );
  horizon=  height/3;
}

void draw() {
  //// Next frame
  if (key == '?') {
    help();
  } else {
    scene();
    action();
    scoring();
  }
}
void help() {
  int x=width/2, y=height/2;
  textSize(12);
  text( "Click to start hero moving.", x,y );
  y +=15;
  text( "Lose 10 points, when monster hits hero.", x,y );
  y +=15;
  text( "Gain 5 points, when birds finish a flight.", x,y );
}

void action() {
  //// Move & draw raw creatures.
  hero();
  monsters();
  birds();
  //// Check collisions
  if ( dist( heroX,heroY, monsterX,monsterY ) < 50 ) {
    background( 0 );
    score -= 10;
    monsterX=  width-20;      // Move monster to left side, random height.
    monsterX=  random( horizon, height);
  }
}

void hero() {
  //// Move & draw hero
  if (heroX<20 || heroX> width-20) heroDX *= -1;    // Bounce
  if (heroY<horizon || heroY> height-20) heroDY *= -1;
  heroX += heroDX;
  heroY += heroDY;
  rectMode( CENTER );
  fill( 0, 255, 255 );
  rect( heroX, heroY, 50, 80);  
  fill( 255, 255, 255 );
  ellipse( heroX, heroY-60, 40,40 );  
}  
void monsters() {
  //// Move & draw monster
  if (monsterX<20 || monsterX> width-20) monsterDX *= -1;
  if (monsterY<horizon || monsterY> height-20) monsterDY *= -1;
  monsterX += monsterDX;
  monsterY += monsterDY;
  fill( 255, 0, 0 );
  ellipse( monsterX, monsterY, 50, 80);  
}
void birds() {
  //// 3 birds fly.      +++++
  birdsX += birdsDX;
  if (birdsX > width) {
    //// Start a new flock of birds (at random height);
    birdsX=  10;
    birdsY=  random( 0, horizon );
    score += 5;        // Gain 5 points, when birds finish a flight.
  }
  //// Draw 3 birds;
  drawBird( birdsX, birdsY );
  drawBird( birdsX-50, birdsY-50 );
  drawBird( birdsX-50, birdsY+50 );
}
void drawBird( float x, float y ) {
  //// Draw one bird at (x,y)
  fill( 0,0,255 );
  triangle( x,y, x-40,y-10, x-40,y+10 );
  fill(random(250) );
  if ( (frameCount/15) % 2 > 0)
    triangle( x-10,y, x-35,y, x-35,y+20 );
   else
    triangle( x-10,y, x-35,y-20, x-35,y );
}
void scene() {
  //// sky, grass, etc.
  background( 200,200,255 );

fill( 100,g,100 );    // grass
  rectMode( CORNERS );
  rect( 0,horizon, width,height );
  //// Titles, etc.
  textSize( 20 );
  text( title, width/3, 40 );
  text( author, 20, height-40 );
}
void scoring() {
  //// Scoreboard
  text( "Score is "+score, width-100, 50 );
}
  
void keyPressed() {
  //// Event handler for keyboard
  if (key == 'q') {
    exit();
  }  else if (key == '+') {
    heroDX *= 1.1 ;         // 10% speedup
    heroDY *= 1.1 ; 
  }  else if (key == '-') {
    heroDX *= 0.9 ; 
    heroDY *= 0.9 ; 
  }
}

void mousePressed() {
  //// Move hero toward mouse-click.
  //--  if (mouseX>heroX) heroDX=  +2;    
  //--  else heroDX=  -2;
  //--  heroDY= (mouseY>heroY) ? +1.5 : -1.5 ;
  heroDX=  (mouseX-heroX) / 60;
  heroDY=  (mouseY-heroY) / 60;

//  heroDY= (mouseY>heroY) ? +1.5 : -1.5 ;
  background( 255 );
}